Heat oil in a pan, saute onions until translucent
Add garlic and saute until aromatic
Add mushrooms and saute for 3-4 minutes
Add stock, paprika and sauce. Bring to boil. Since stock had salt, I have skipped it
Cook on medium heat for 3-4 minutes. Add sour cream. Mix well. Reduce heat to low.
Cook for 5-6 minutes. Add parsley. Serve hot. The gravy is generally used for noodles or rice